Not really an answer I know, but too long for the comments...
This is still too broad a question. a well sealed, sterile plastic usually has a use by date, but can probably be used more than a year after you receive it. But these cases are not usually the issue.
Its sterile medium and chemicals, each of which needs to have their own due date. LB can be used months after autoclaving, but antibiotics break down chemically in weeks (ampicillin 1000x stocks lose their potency in a month). Even in the refrigerator Agar plates show colonies after a couple of months and dry out quickly.
So more details would be necessary and the case by case policy is the rule.
added in response to comments
Its really a matter of how well they are sealed. An autoclaved bottle will stay sterile forever, until something gets into the bottle - it depends on how well you have sealed things up and the storage conditions. For stuff sterilized in lab I would tend to use it within a couple of months. For eppendorfs we'd tend to sterilize a few hundred in a beaker and not worry about them...
Our experiments were working with purified protein were only medium sensitive to bio-contamination; they would be done in a few hours and then sterile filtered again. If you were purifying RNA for instance you would be much more paranoid I'm sure.
If you start to see contamination I would lower the use date and or improve your protocol.
Plastics that come sterilized and sealed by the manufacturer in 3-5 mil plastic bags have really long use by dates and I've used them for up to a year after we received them.